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  <div class="section" id="extensions">
<span id="index-0"></span><h1>Extensions<a class="headerlink" href="#extensions" title="Permalink to this headline">¶</a></h1>
<p>Extensions add functionality to HydroDesktop.  For example, a Fetch Basemap extension might enable HydroDesktop to display basemaps from online maps services.  This extension might add a few buttons to the HydroDesktop user interface to give the user control over the choice and display properties of the basemap.  A nice thing about extensions is that they can contain very specific functionality when it does not make sense to include such specific functionality in the general HydroDesktop user interface.  Extensions can also be created and added to HydroDesktop without requiring access to the HydroDesktop source code and without requiring rebuilding HydroDesktop from the source code.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">While it might be temping to enable all extensions, keep in mind that extensions often add buttons or other items to the user interface, and require memory to operate.  To keep your user interface from getting cluttered, and to keep HydroDesktop running as efficiently as possible, it&#8217;s a good idea to only enable extensions that you use.</p>
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<p class="first admonition-title">Tip</p>
<p class="last">Extensions can be enabled by clicking the HydroDesktop Orb Button.</p>
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<p>HydroDesktop Extensions:</p>
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<li class="toctree-l1"><a class="reference internal" href="EpaTools/EPA-tool.html">EPA Tools</a><ul>
<li class="toctree-l2"><a class="reference internal" href="EpaTools/EPA-Delineation.html">EPA Delineation</a><ul>
<li class="toctree-l3"><a class="reference internal" href="EpaTools/EPA-Delineation.html#delineating-your-watershed">Delineating Your Watershed</a></li>
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<li class="toctree-l1"><a class="reference internal" href="FetchBasemap/FetchBasemap.html">Fetch Basemap</a><ul>
<li class="toctree-l2"><a class="reference internal" href="FetchBasemap/FetchBasemap.html#selecting-a-basemap-service">Selecting a Basemap Service</a></li>
<li class="toctree-l2"><a class="reference internal" href="FetchBasemap/FetchBasemap.html#changing-basemap-opacity">Changing Basemap Opacity</a></li>
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<li class="toctree-l2"><a class="reference internal" href="HydroModeler/Intro.html">Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="HydroModeler/Scope.html">Scope</a></li>
<li class="toctree-l2"><a class="reference internal" href="HydroModeler/Part1.html">Part 1 - Getting started</a><ul>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part1.html#starting-hydrodesktop">Starting HydroDesktop</a></li>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part1.html#hydromodeler-plugin">HydroModeler Plugin</a></li>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part1.html#open-an-existing-model">Open an Existing Model</a></li>
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<li class="toctree-l2"><a class="reference internal" href="HydroModeler/Part2.html">Part 2 - Adjusting Model Input</a><ul>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part2.html#data">Data</a></li>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part2.html#defining-a-watershed">Defining a Watershed</a></li>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part2.html#creating-component-inputs">Creating Component Inputs</a><ul>
<li class="toctree-l4"><a class="reference internal" href="HydroModeler/Part2.html#the-scs-curve-number-component">The SCS Curve Number Component:</a></li>
<li class="toctree-l4"><a class="reference internal" href="HydroModeler/Part2.html#scs-unit-hydrograph-component">SCS Unit Hydrograph Component:</a></li>
<li class="toctree-l4"><a class="reference internal" href="HydroModeler/Part2.html#muskingum-component">Muskingum Component:</a></li>
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<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part2.html#creating-a-new-model-composition">Creating a New Model Composition</a></li>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part2.html#component-definitions">Component Definitions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="HydroModeler/Part3.html">Part 3 - Creating a Component</a><ul>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part3.html#getting-stared-with-visual-c">Getting stared with Visual C#</a></li>
<li class="toctree-l3"><a class="reference internal" href="HydroModeler/Part3.html#sample-component">Sample Component</a><ul>
<li class="toctree-l4"><a class="reference internal" href="HydroModeler/Part3.html#references">References</a></li>
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<li class="toctree-l4"><a class="reference internal" href="HydroModeler/Part3.html#methods">Methods</a></li>
<li class="toctree-l4"><a class="reference internal" href="HydroModeler/Part3.html#compiling">Compiling</a></li>
<li class="toctree-l4"><a class="reference internal" href="HydroModeler/Part3.html#hydrodesktop">HydroDesktop</a></li>
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<li class="toctree-l1"><a class="reference internal" href="HydroR/HydroR.html">HydroR</a><ul>
<li class="toctree-l2"><a class="reference internal" href="HydroR/Introduction.html">Introduction</a><ul>
<li class="toctree-l3"><a class="reference internal" href="HydroR/Introduction.html#prerequisites">Prerequisites</a></li>
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<li class="toctree-l2"><a class="reference internal" href="HydroR/OpeningHydroR.html">Opening the HydroR Extension</a></li>
<li class="toctree-l2"><a class="reference internal" href="HydroR/LoadingData.html">Loading Data Series Into R from HydroDesktop</a></li>
<li class="toctree-l2"><a class="reference internal" href="HydroR/CreatingRCommands.html">Creating R Commands in the HydroR Script Editor</a></li>
<li class="toctree-l2"><a class="reference internal" href="HydroR/ExecutingRCode.html">Executing R Code from the HydroR Script Editor</a></li>
<li class="toctree-l2"><a class="reference internal" href="HydroR/SavingRScripts.html">Saving R Scripts and Opening Them Later</a></li>
<li class="toctree-l2"><a class="reference internal" href="HydroR/RCommands.html">R Commands Indluded in the HydroR Package for R</a></li>
<li class="toctree-l2"><a class="reference internal" href="HydroR/ClosingRConsole.html">Closing the R Console</a></li>
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<li class="toctree-l2"><a class="reference internal" href="GraphView/Introduction.html">Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="GraphView/VisualizingDataintheGraphView.html">Visualizing Data in the Graph View</a></li>
<li class="toctree-l2"><a class="reference internal" href="GraphView/ZoomingInandOutOnPlots.html">Zooming In and Out On Plots</a></li>
<li class="toctree-l2"><a class="reference internal" href="GraphView/ChangingthePlotTypeandDisplayingSummaryStatistics.html">Changing the Plot Type and Displaying Summary Statistics</a></li>
<li class="toctree-l2"><a class="reference internal" href="GraphView/SettingtheDateRange.html">Setting the Date Range</a></li>
<li class="toctree-l2"><a class="reference internal" href="GraphView/ChangingthePlotOptions.html">Changing the Plot Options</a></li>
<li class="toctree-l2"><a class="reference internal" href="GraphView/ExportingthePlotImage.html">Exporting the Plot Image</a></li>
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